EP2167025B1 - Preservative-free compositions comprising cinnamic or anisic acid and a benzaldehyde (derivative) - Google Patents

Preservative-free compositions comprising cinnamic or anisic acid and a benzaldehyde (derivative) Download PDF

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Publication number
EP2167025B1
EP2167025B1 EP08757266.5A EP08757266A EP2167025B1 EP 2167025 B1 EP2167025 B1 EP 2167025B1 EP 08757266 A EP08757266 A EP 08757266A EP 2167025 B1 EP2167025 B1 EP 2167025B1
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Prior art keywords
personal care
care product
benzaldehyde
product composition
oil
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EP08757266.5A
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German (de)
English (en)
French (fr)
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EP2167025A2 (en
Inventor
Andreas Natsch
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Givaudan SA
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Givaudan SA
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/34—Alcohols
    • A61K8/347—Phenols
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N35/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having two bonds to hetero atoms with at the most one bond to halogen, e.g. aldehyde radical
    • A01N35/04—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having two bonds to hetero atoms with at the most one bond to halogen, e.g. aldehyde radical containing aldehyde or keto groups, or thio analogues thereof, directly attached to an aromatic ring system, e.g. acetophenone; Derivatives thereof, e.g. acetals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/10—Aromatic or araliphatic carboxylic acids, or thio analogues thereof; Derivatives thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
    • A01N37/38—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system
    • A01N37/40—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/36—Carboxylic acids; Salts or anhydrides thereof
    • A61K8/368—Carboxylic acids; Salts or anhydrides thereof with carboxyl groups directly bound to carbon atoms of aromatic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
    • A61Q17/005—Antimicrobial preparations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/52—Stabilizers
    • A61K2800/524—Preservatives

Definitions

  • essentially preservative-free personal care product compositions and their use in personal care products applied to the human skin or scalp, and methods of making such products.
  • Preservatives are used in personal care products (products applied to the skin or scalp either to remain there or to be rinsed off) to preserve these products against microbial spoilage and to extend their shelf life.
  • Antimicrobial compounds used for product preservation may fall into one or more of the following classes based on the effect they have on the microorganism, in particular bacteria and fungi.
  • An antibacterial or antifungal may inhibit growth of the microorganisms or kill them or both.
  • a bacteriostatic compound inhibits growth of bacteria, while a bactericide kills bacteria (reduces their number).
  • a fungistatic compound inhibits the growth of fungi (molds and yeast), while a fungicide kills fungi (reduces their number).
  • a sporicide kills spores of fungi or bacteria. Spores, especially endospores, are formed by some bacteria to survive during periods of deprivation and are significantly more difficult to kill. Fungi form spores for reproduction and these spores are significantly more difficult to kill than the vegetative form of the fungi. Many antimicrobial compounds are therefore not effective against fungal spores.
  • a broad band preservative effect including a bactericidal and fungicidal activity was previously only attained in personal care products by addition of certain preservatives, in particular formaldehyde, formaldehyde donors, halogenated compounds, compounds belonging to the class of parabens and a variety of specific fungicides.
  • Formaldehyde donors include in particular diazolidinyl urea ( CAS 78491-02-8 ), imidazolidinyl urea ( CAS 39236-46-9 ), and DMDM Hydantoin ( CAS 6440-58-0 ).
  • Halogenated compounds include in particular 2,4-dichlorobenzyl-alcohol (CAS 1777-82-8 ), Chloroxylenol (also known as 4-chloro-3,5-dimethyl-phenol, CAS 88-04-0 ), Bronopol (also known as 2-bromo-2-nitropropane-1,3-diol, CAS 52-51-7 ), iodopropynyl butyl carbamate ( CAS 55406-53-6 ).
  • Paraben compounds include in particular Methyl-paraben ( CAS 99-76-3 ), Ethyl-paraben ( CAS 120-47-8 ), Propyl-paraben ( CAS 94-13-3 ), Butyl-paraben ( CAS 94-26-8 ), Isopropyl-paraben ( CAS 4191-73-5 ), and Benzyl-paraben ( CAS 94-18-8 ).
  • preservatives include Quaternium-15 ( CAS 51229-78-8 ), methyl-chloroisothiazolinone ( CAS 26172-55-4 ), and methylisothiazolinone ( CAS 2682-20-4 ).
  • Applicant suprisingly identified a combination of fragrance compounds that enables to provide essentially preservative-free personal care product compositions that display a stabilizing effect, in particular a broadband antimicrobial action including a sporicidal effect. Due to their well known characteristics and their primary use as fragrance, the compounds of the discovered combination are not considered preservatives in the industry and accordingly do not have to be labelled as such.
  • Benzaldehyde and benzaldehyde derivative compounds have previously been shown to have a fungistatic effect against various food spoilage molds and yeasts.
  • the antifungal activity of a given antifungal against a given fungal species varies with the food product in which it is used, possibly due to the concentration of lipids or proteins.
  • Fitzgerald et al. report vanillin and various derivatives to have antifungal (fungistatic) activity against a variety of food molds including various Aspergillus species (A. oryzae, A sojae), Penicillium species, and yeast strains when tested in yeast extract peptone dextrose broth.
  • the efficacy against various fungal strains varies. Fungicidal or sporicidal activities were not tested. ( J. Agric. Food Chem. 2005, 53, 1769-1775 ).
  • heliotropin is known to be active as a fungistatic compound in vaporous form when applied to fungi on tobacco leaves, and to have an antifungal and antibacterial effect against some fungi and bacteria in aqueous culture media.
  • the germicidal effect in particular the bactericidal and fungicidal effect, is generally considered to be low, especially when the pH is within the range commonly used in personal care products which is pH 5 to pH 9. While some compounds are known to be more active under extremely acidic or alkaline conditions, this effect does not extend to the pH range used in personal care products.
  • An activity or lack of activity of a given test compound in water is not indicative of an activity in a personal care product, for example a cosmetic cream.
  • a personal care product composition as described herein, wherein the at least one benzaldehyde or benzaldehyde-derivative compound a) is present in a concentration of 0.075 to 0.3% (w/w), optionally 0.1 to 0.2%, (w/w), and wherein the at least one fragrant acid b) is present in a concentration of 0.075 to 0.3% (w/w), optionally 0.1 to 0.2% (w/w).
  • a personal care product composition as described herein, further comprising at least one aromatic alcohol or derivative thereof selected from the group consisting of phenylethyl alcohol, phenyl propyl alcohol, benzyl formiate, and phenethyl formiate.
  • a personal care product composition as described herein, further comprising an antimicrobial fragrance ingredient selected from the group consisting of Geranium oil, Peppermint oil, Rose oil, Cinnamon leaf oil, Fucus oil, Clove bud oil, Clove leaf oil, Palmarosa oil, Citrus oil, Terpene fraction of citrus oil, Orange oil, Terpene fraction of orange oil, Geraniol, Cuminic alcohol, Perilla alcohol, Citronellol, Eugenol, Cinnamic alcohol, Nerol, Menthol, Borneol, Octan-1-ol, Nonan-1-ol, Decan-1-ol, Dec-9-en-1-ol, Limonene, 2,6-dimethyl-7-octen-2-ol, 3-methyl-5-phenyl-pentanol, 2-methyl-5-phenyl-pentanol, undec-10-en-1-ol, 4-(1-methylethyl)-cyclohexanol, 4-(1,1-dimethyl)-cyclohex
  • a personal care product composition as described herein, further comprising at least one aromatic alcohol or derivative thereof as described herein, and at least one antimicrobial fragrance ingredient as described herein.
  • compositions for personal care products applied to and left on the skin or scalp including but not limited to creams, salves, lotions, and ointments for hand, face or body, perfumes, eau de Cologne, eau de toilet, deodorants, antiperspirants, and products applied but rinsed off including but not limited to soaps, liquid soaps, shower gels, and shampoos.
  • a personal care product comprising the composition as described herein, selected from an application form selected from stick, roll-on, spray, pump-spray, aerosol, soap bar, powder, solution, gel, cream, balm and lotion.
  • composition in another embodiment, wherein the composition is an emulsion.
  • a personal care product composition as described herein, wherein the benzaldehyde or benzaldehyde-derivative compound a) and the fragrant acid b) as described herein, the aromatic alcohols or derivatives thereof as described herein, and the antimicrobial fragrance ingredients as described herein that are present in the composition exclusively are compounds or ingredients that occur in nature.
  • compositions as described herein, wherein all ingredients of the composition consists exclusively of compounds or ingredients that occur in nature.
  • a personal care product composition as described herein, wherein the compounds or ingredients that occur in nature have been extracted or purified from a natural source including but not limited to a botanical source, or that have been formed by natural processes including but not limited to fermentation.
  • a method of forming a stabilized personal care product which is sufficiently bactericidal to have a reduction factor for Pseudomonas aeruginosa and Staphylococcus aureus of at least 1000 per 7 days, and which is sufficiently sporicidal to have a reduction factor of at least 100 per 7 days for Aspergillus niger.
  • a personal care product base by admixing an effective amount of at least one benzaldehyde or benzaldehyde-derivative compound a) and an effective amount of at least one fragrant acid b) as described herein, to a personal care product base, wherein optionally said compounds a) and b) may be added in form of a pre-prepared fragrance composition comprising said compounds a) and b), forming a personal care product composition as described herein.
  • the total concentration of the at least one benzaldehyde or benzaldehyde-derivative compound a) in the personal care product composition is from 0.05% to 1 % (w/w), optionally from 0.3 to 0.7%
  • the total concentration of the at least one fragrant acid b) in the personal care product composition is from 0.05% to 1 % (w/w), optionally 0.3 to 0.7%.
  • the personal care product composition formed further comprises at least one aromatic alcohol or derivative thereof selected from the group consisting of phenylethyl alcohol, phenyl propyl alcohol, benzyl formiate, and phenethyl formiate.
  • the personal care product composition formed further comprises at least one antimicrobial fragrance ingredient as described herein.
  • the personal care product composition formed further comprises at least one aromatic alcohol or derivative thereof selected from the group consisting of phenylethyl alcohol, phenyl propyl alcohol, benzyl formiate, and phenethyl formiate; and at least one antimicrobial fragrance ingredient as described herein.
  • the personal care product composition is or is brought into the form of a personal care product including sticks, roll-ons, sprays, pump-sprays, aerosols, soap bars, powders, solutions, gels, creams, balms and lotions.
  • the personal care products described herein are essentially preservative-free, meaning that they may contain only traces of preservatives as herein defined, whose concentration is substantially below their effective antimicrobial concentration, for example, at least 5 times or 10 times less. Such traces can be due to, for example, impurities of one or more ingredients of a personal care product or preserved ingredients/excipients used in low concentrations in personal care products.
  • preservative refers to a preservative or combination of preservatives listed herein below.
  • Preservatives are substances which may be added to personal care products for the primary purpose of inhibiting the development of micro-organisms in such products.
  • Salts' of preservatives is taken to mean: salts of the cations sodium, potassium, calcium, magnesium, ammonium and ethanolamines; salts of the anions chloride, bromide, sulphate, acetate.
  • Esters' of preservatives is taken to mean: esters of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, phenyl.
  • Compounds b) are fragrant acids selected from cinnamic acid and anisic acid. Their chemical structures are shown below. cinnamic acid anisic acid
  • Optional ingredients including optional ingredients to further improve the stabilization against microbial spoilage may be present in personal care products as herein described.
  • the personal care product may contain one or more aromatic alcohol or derivative thereof as optional ingredient, in particular phenylethyl alcohol, phenyl propyl alcohol, benzyl formiate, and phenethyl formiate. These compounds are commonly used in personal care products as fragrance. Their structural formulae are shown below. Aromatic alcohol or derivative structural formula 2-Phenylethyl alcohol 3-Phenyl propyl alcohol Benzyl formiate Phenethyl Formiate
  • ingredients to further improve the stabilization of the products against microbial spoilage may be antimicrobial (bactericidal and/or fungicidal) fragrance ingredients or compounds.
  • Antimicrobial fragrant natural oils include but are not limited to:
  • Geranium oil Peppermint oil, Rose oil, Cinnamon leaf oil, Fucus oil, Clove bud oil, Clove leaf oil, Palmarosa oil, Citrus Oil, Terpene-fraction from citrus oil, Orange oil, Terpene-fraction from orange oil
  • Antimicrobial fragrance compounds found in natural essential oils include but are not limited to:
  • Geraniol Cuminic alcohol, Perilla alcohol, Citronellol, Eugenol, Cinnamic alcohol, Nerol, Menthol, Borneol, Octan-1-ol, Nonan-1-ol, Decan-1-ol, Dec-9-en-1-ol, and Limonene.
  • Synthetic antimicrobial fragrance alcohols include but are not limited to:
  • Synthetic antimicrobial fragrance aldehydes include but are not limited to:
  • Synthetic antimicrobial fragrance lactones include but are not limited to:
  • Antimicrobial fragrance lactones found in nature include but are not limited to:
  • the antimicrobial fragrance compounds may be synthesized or extracted from natural sources including but not limited to botanical sources, for examples fragrant natural oils derived from plants or part of plants, including but not limited to Geranium oil, Peppermint oil, Rose oil, Cinnamon leaf oil, Fucus oil, Clove bud oil, Clove leaf oil, Palmarosa oil, Citrus oil (for example: terpene fraction), and Orange oil (for example: terpene fraction).
  • natural oils derived from plants or part of plants including but not limited to Geranium oil, Peppermint oil, Rose oil, Cinnamon leaf oil, Fucus oil, Clove bud oil, Clove leaf oil, Palmarosa oil, Citrus oil (for example: terpene fraction), and Orange oil (for example: terpene fraction).
  • Bases for personal care products are well known in the art and the resulting personal care product will usually have a pH of pH5 to pH9 (for example, slightly acidic for products applied to and left on the skin, slightly alkaline for soap products). It is also possible to employ an existing preservative-free personal care product composition and simply add a) and b) in the concentrations hereinabove defined and mix thoroughly.
  • concentration of compounds under a) and b) that is employed in a composition will depend upon the nature of the product, the stabilisation effect against microbial spoilage (in particular the bactericidal, fungicidal and sporicidal activity), and the length of this effect to be achieved.
  • a useful concentration for the compound a) is, for example, without limitation, 0.05 to 0.5%, 0.075 to 0.3%, and 0.1 to 0.2% (w/w).
  • a useful concentration for the compound b) is, for example, 0.05 to 0.5%, 0.075 to 0.3%, and 0.1 to 0.2% (w/w). If combined in the given concentrations, compounds a) and b) generally provide a sufficient bactericidal, fungicidal and sporicidal activity in a wide range of personal care product compositions.
  • a sufficient bactericidal activity is attained when the reduction factor is 1000 per 7 days.
  • a sufficient sporicidal activity is attained when the reduction factor is 100 per 7 days.
  • a sufficient sporicidal activity is strongly indicative of a sufficient fungicidal activity.
  • the reduction factor is determined by growing a suitable test organism ( Aspergillus niger for fungi, Pseudomonas aeruginosa for gram-negative bacteria and Staphylococcus aureus for gram-positive bacteria) on a suitable culture medium on agar plates, harvesting and adding to a personal care product composition in a density of 3x10 5 organism/ml and counting the surviving organisms in the probe and a negative control at defined time interval, commonly 7 days. The count of the negative control is divided by the count of the probe and thereby the reduction factor is determined (compare example 1).
  • b)-compounds of particular interest are 4-hydroxybenzaldehyde and 3-hydroxybenzaldehyde, for their surprisingly good activity.
  • the addition of hydroxy groups to benzaldehyde and derivatives was previously shown not to provide a fungicidal effect on A. niger.
  • Personal care product compositions are used to form a personal care product in an appropriate application form and packaging, as is well-known in the art.
  • Personal care products and compositions to form them as decribed herein are used for the purpose of cleansing, conditioning, grooming, beautifying, promoting attractiveness, or otherwise enhancing or altering the appearance of the human body and are applied to the human skin or scalp.
  • These include products applied to and left on the skin or scalp, for example creams, salves, lotions, and ointments for hand, face or body, perfumes, eau de Cologne, eau de toilet, deodorants, antiperspirants, and products applied but rinsed off such as soaps, liquid soaps, shower gels, shampoos.
  • These products can, for example, take various forms of application, for example sticks, roll-ons, sprays, pump-sprays, aerosols, soap bars, powders, solutions, gels, creams, balms and lotions.
  • lipid-containing products Many personal care products will be formulated as an emulsion or other lipid-containing products and these form a particular aspect of the embodiments described-herein.
  • Lipids are often included for example into washing formulations including liquid soaps or washing lotions to provide an oil replenishing effect.
  • the a) and b) compounds as hereinabove defined allow the formulation of stabilized emulsions or formulations comprising lipids and/or detergents where the activity (the bactericidal, fungicidal and in particular the sporicidal effect) is not lost due to the presence of the lipid base and/or detergents or surfactants.
  • personal care product compositions as described herein may also be combined with art-recognised quantities of other excipients commonly employed in these products; useful selections may be found in « CTFA Cosmetic Ingredient Handbook » J.M. Nikitakis (ed.), 1st ed., The Cosmetic, Toiletry and Fragrance Association, Inc., Washington, 1988 , which is hereby incorporated by reference.
  • excipients may, for example, include colorants, fragrances, solvents, surfactants, colorants, opacifiers, buffers, antioxidants, vitamins, emulsifiers, UV absorbers, silicones and the like. All products can also be buffered to the desired pH using commonly-available excipients in a known manner. There now follows a series of non-limiting examples that serve to illustrate the invention.
  • compositions, products, and related methods have been described above in connection with certain illustrative embodiments, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiments for performing the same function. Further, all embodiments disclosed are not necessarily in the alternative, as various embodiments may be combined to provide the desired characteristics. Variations can be made by one having ordinary skill in the art without departing from the scope of the disclosure. Therefore, the compositions, products and methods should not be limited to any single embodiment, but rather construed in breadth and scope in accordance with the recitation of the attached claims.
  • Aspergillus niger ATCC 16404 spores are added to water to obtain a density of 3 ⁇ 10 5 spores / ml.
  • the test strain is grown for 5 days on potato dextrose agar at room temperature.
  • the spores are harvested with a solution containing 0.1% Tween 80, peptone 0.1% and NaCl 0.85% and the spore concentration is adjusted to the density indicated above.
  • Test compounds are dissolved in dipropyleneglycol to a concentration of 20%. These stock solutions are added to 10 ml aliquots of the spore suspension to obtain a final concentration of the test compounds of 0.1%.
  • the sporicidal effect is shown by a reduction of spore counts after 7 days.
  • the reduction factor is determined as follows. Aliquots of the above prepared suspension of microorganisms (here: spore suspension prepared as described above) are plated on a suitable agar medium (see above) and the developing colonies are counted both for samples with test compound and for a negative probe (water). The count of the negative control is divided by the count of the test compound and thereby the reduction factor is determined. A negative control (water) accordingly has a reduction factor of 1 (no effect on the microorganism).
  • a preservative-free cosmetic cream for application to the human skin is used (Cremor basalis, Fagron GmbH, Barsbüttel, Germany).
  • Test samples of cream contain different amounts of compounds a) and b) added to an aliquot of 10 g of the cream in 50 ml tubes to give a concentration (w/w) of 0.125-0.25% as shown in the table below. After addition of the compounds a) and b), the cream is thoroughly mixed to achieve a homogeneous distribution.
  • Test samples of the same cream used in Example 2 contain different amounts of compounds a) and b) added to an aliquot of 10 g of the cream in 50 ml tubes to give a concentration (w/w) of 0.125-0.25% as shown in the table below. After addition of the compounds a) and b), the cream is thoroughly mixed to achieve a homogeneous distribution.
  • Staphylococcus aureus (DSMZ 799) and Pseudomonas aeruginosa (ATCC 15442) are used.
  • the strains are grown overnight in Mueller-Hinton broth and adjusted to a cell density of 1 x 10 8 cfu (colony forming units) per ml.
  • the two bacterial strains are mixed in a ratio of 1:1 and 100 ⁇ l of this mixed inoculum is added to 10 ml aliquots of the cosmetic cream.
  • Table below shows the reduction factor of bacterial counts after 24 h for anisic acid or cinnamic acid (in form of their sodium salts) when combined with 4-hydroxybenzaldehyde (4-HBA) in a skin cream.
  • Table 2 bactericidal effect of cosmetic cream samples with anisic acid and cinnamic acid alone or in combination with 4-HBA.
  • Fragrant Acid Concentration Fragrant Acid [% w/w] Concentration 4-HBA [% w/w] Reduction factor (*) none 0.125 10 Anisic acid 0.250 0 5 Anisic acid 0.250 0.125 > 1000 Anisic acid 0.125 0 1 Anisic acid 0.125 0.125 > 1000 Cinnamic acid 0.250 0 10 Cinnamic acid 0.250 0.125 > 1000 Cinnamic acid 0.125 0 2.0 Cinnamic acid 0.125 0.125 > 1000

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EP08757266.5A 2007-06-22 2008-06-17 Preservative-free compositions comprising cinnamic or anisic acid and a benzaldehyde (derivative) Active EP2167025B1 (en)

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GB0712024D0 (en) 2007-08-01
CN101686914B (zh) 2013-09-25
US20100183692A1 (en) 2010-07-22
MX2009013507A (es) 2010-01-20
CN101686914A (zh) 2010-03-31
EP2167025A2 (en) 2010-03-31
BRPI0813730B1 (pt) 2016-09-13
WO2009000097A3 (en) 2009-06-25
JP2010530855A (ja) 2010-09-16
BRPI0813730A2 (pt) 2014-12-30
WO2009000097A2 (en) 2008-12-31

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